[clang] [llvm] [WebAssembly] Change to 64-bit table indices on Wasm64 (PR #180649)

[Sam Clegg via cfe-commits]

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sbc100 wrote:

Is this testing the MC layer or the codegen?   Ideally most there in the MC directory should be written in assembly.  If it needs to be written in LLVM IR then maybe its testing something codegen related and should live in the codegen test directory?

https://github.com/llvm/llvm-project/pull/180649